MEDC CU1-S Manuel Technique page 5

Access to Controls:
The volume control, flash rate selection (where available) and tone selection can be accessed through the lens cover
assembly.
Unscrew the socket set screw (2mm A/F hexagon key) in the lens cover three full turns. Unscrew and remove the
lens cover. The required adjustments can then be made using the correct PCB mounted controls.
Once the required adjustments have been made, replace the cover using the same procedure as above but in the
reverse manner. Care must be taken to avoid damage to the threads and mating faces of the cover and
enclosure. Ensure the o-ring is correctly seated on the cover and that the cover is screwed down tightly such that the
maximum gap between the cover and enclosure is 0.2mm. Ensure the socket set screw in the cover assembly is
fully tightened to secure the cover assembly on the body.
Volume Control (10J CU1-S units only):
The volume on both the AC and DC units can be controlled by means of a potentiometer (VR1) mounted on the top
face of the xenon PCB. Maximum volume is obtained by turning the potentiometer fully clockwise. Conversely,
turning the potentiometer in an anti-clockwise direction will reduce the volume until no sound will be heard. Do not
attempt to adjust the potentiometer beyond its limits as this may cause damage and prevent correct operation of
the unit.
Flash Rate Adjustment (DC supply units only):
The flash rate can be selected by means of a jumper switch mounted on the top face of the xenon PCB accessible
through the xenon cover assembly (see the access to controls section for details). Three positions are available for
selection (SP, F80 & F120) which provide the following fpm (flashes per minute) rates:
SP – 60 fpm (Standard unless otherwise specified when ordering unit)
F80 – 80 fpm
F120 – 120 fpm
The flash rate of the AC units is preset by MEDC prior to shipping and cannot be adjusted once set.
Tones:
Notes:
The term 'remote initiate' covers both the telephone initiate and the 24Vdc relay initiate options
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'Single stage' means that bank 1 of the tone selection switches is enabled allowing the selection of 1 of up
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to 27 user selectable tones
'Dual stage' means that bank 2 of the tone selection switches is also enabled allowing the selection of 1 of
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up to 27 user selectable tones. The user can switch between the tones selected on banks 1 and 2. Dual
stage is only available on DC units.
The unit is available in the following configurations:
1. DC input, single sage sounder, direct initiate, combined sounder/beacon operation
2. DC input, single stage sounder, remote initiate, combined sounder/beacon operation
3. DC input, single stage sounder, direct initiate, independent sounder and beacon operation
4. DC input, Dual stage sounder, direct initiate, combined sounder/beacon operation
5. DC input, Dual stage sounder, remote initiate, combined sounder/beacon operation
6. DC input, Dual stage sounder, direct initiate, independent sounder and beacon operation
7. AC input, single stage sounder, direct initiate, combined sounder/beacon operation
8. AC input, single stage sounder, remote initiate, combined sounder/beacon operation
9. AC input, single stage sounder, direct initiate, independent sounder and beacon operation
Type 1. The supply should be connected to T1 (+ve) & T2 (-ve), loop out on T3 & T4 respectively.
Type 2. The supply should be connected to T1 (+ve) & T2 (-ve), loop out on T3 & T4 respectively. The initiate
supply should be connected to T5 (+ve / live) & T6 (-ve / neutral), loop out on T7 & T8 respectively.
Type 3. The supply should be connected to T1 (sounder +ve) & T2 (common -ve), loop out on T3 & T4 respectively.
The independent +ve supply for the beacon should be connected to T7, loop out on T8.
Type 4. The supply should be connected to T1 (common +ve), T2 (-ve) & T3 (-ve 2), loop out on T4, T5 & T6
respectively. Alternatively an EOL resistor can be connected to T4, T5 or T4, T6.
© MEDC 2014 09/14